Daily Dispersion Outlook
Issued by NWS Pendleton, OR

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443
AUUS46 KPDT 231246
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
446 AM PST THU FEB 23 2017

*** AIR DISPERSION CATEGORIES:   GOOD, FAIR, POOR ***

FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SW 3-7 MPH.         W-NW 5-10 MPH.
TRANSPORT WINDS               SW 3-7 MPH.         NW 9-13 MPH.
MIXING HEIGHT                 NEAR SURFACE.       6000 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR FRI FEB 24        POOR.

VENTILATION INDEX (CATEGORY)  38 (POOR).          417 (FAIR).
OUTLOOK FOR FRI FEB 24        515 (FAIR).

FOR THE UPPER YAKIMA VALLEY INCLUDING YAKIMA...UNION GAP...
SELAH...AND NACHES AREA

                              7:00 AM             AFTERNOON
SURFACE WINDS                 W-NW 4-8 MPH.       NW 2-5 MPH.
TRANSPORT WINDS               W-NW 4-8 MPH.       NW 5-10 MPH.
MIXING HEIGHT                 NEAR SURFACE.       6000 FT MSL.
DISPERSION CATEGORY           POOR.               POOR.
OUTLOOK FOR FRI FEB 24        POOR.

VENTILATION INDEX (CATEGORY)  26 (POOR).          213 (POOR).
OUTLOOK FOR FRI FEB 24        254 (POOR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 NW 6-11 MPH.        NW 10-17 MPH.
TRANSPORT WINDS               NW 9-12 MPH.        NW 13-22 MPH.
MIXING HEIGHT                 4500 FT MSL.        8500 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR FRI FEB 24        FAIR.

VENTILATION INDEX (CATEGORY)  158 (POOR).         623 (GOOD).
OUTLOOK FOR FRI FEB 24        224 (POOR).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      301 (FAIR)
ELLENSBURG    261 (POOR)
GOLDENDALE    190 (POOR)
TRI-CITIES    404 (FAIR)
WALLA WALLA   296 (POOR)
YAKIMA        184 (POOR)
BEND          646 (GOOD)
PRINEVILLE    596 (FAIR)
ENTERPRISE    656 (GOOD)
HERMISTON     376 (FAIR)
JOHN DAY      947 (GOOD)
LA GRANDE     689 (GOOD)
MADRAS        516 (FAIR)
MEACHAM       536 (FAIR)
PENDLETON     500 (FAIR)
REDMOND       622 (GOOD)
SENECA        896 (GOOD)
THE DALLES    438 (FAIR)

METEOROLOGICAL INFORMATION PROVIDED IN THIS PRODUCT REPRESENTS ONLY
SOME OF THE FACTORS USED IN BURN DECISIONS.  BURN DECISIONS ARE
OUTSIDE THE PURVIEW OF THE NATIONAL WEATHER SERVICE.

THE VENTILATION INDEX IS A TOOL TO ASSIST SMOKE MANAGEMENT
AGENCIES IN DETERMINING BURN OR NO BURN DECISIONS.  A VENTILATION
INDEX GRAPHIC IS ON THE PENDLETON WEBSITE AT THE FOLLOWING ADDRESS:
HTTP://WWW.WRH.NOAA.GOV/PDT/FORECAST/FWXGRAPHICALVENTILATION.PHP?WFO=PDT

IF YOU WOULD LIKE TO KNOW MORE ABOUT THIS PRODUCT...CONTACT THE
NATIONAL WEATHER SERVICE IN PENDLETON.
$$



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